-Extract the contents of Office Communicator onto a network share
-Open Group Policy Management
- Edit your "Default Domain Policy", or make a new one (it's up to you)
- Go to Computer Configuration=>Policies=>Software Settings=>Software Installation
- Right-click it and choose "New=>Package"
- Go ahead and locate the extracted software in the network share and find the "Communicator.msi" file and choose to package it.
- Choose "Assigned" and click OK
- Now, right-click the package you just created and choose "All Tasks=>Remove..."
- Leave the following option "Immediately uninstall the software from users and computers".
You could try this and see if it works. I don't know if it will only remove the software IF it was installed previously though. If it doesn't work, there's another method, it's just a little more complex.